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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6007ca06574af3bac72e7b68ccae4e1b2f1380cbee9c3ab815189e47a3129f49' 
  AND token = 'Leek0AOKs5UtjQoGIfbmUCa9Q1zkIehHN/R4pgS5HvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}